+++ /dev/null
-/*
- * Acess OS
- * Ext2 Driver Version 1
- */
-/**
- * \file dir.c
- * \brief Second Extended Filesystem Driver
- * \todo Implement file full write support
- */
-#define DEBUG 1
-#define VERBOSE 0
-#include "ext2_common.h"
-
-// === MACROS ===
-#define BLOCK_DIR_OFS(_data, _block) ((Uint16*)(_data)[(_block)])
-
-// === PROTOTYPES ===
-char *Ext2_ReadDir(tVFS_Node *Node, int Pos);
-tVFS_Node *Ext2_FindDir(tVFS_Node *Node, const char *FileName);
- int Ext2_MkNod(tVFS_Node *Node, const char *Name, Uint Flags);
- int Ext2_Relink(tVFS_Node *Node, const char *OldName, const char *NewName);
- int Ext2_Link(tVFS_Node *Parent, tVFS_Node *Node, const char *Name);
-// --- Helpers ---
-tVFS_Node *Ext2_int_CreateNode(tExt2_Disk *Disk, Uint InodeId);
-
-// === GLOBALS ===
-tVFS_NodeType gExt2_DirType = {
- .TypeName = "ext2-dir",
- .ReadDir = Ext2_ReadDir,
- .FindDir = Ext2_FindDir,
- .MkNod = Ext2_MkNod,
- .Relink = Ext2_Relink,
- .Link = Ext2_Link,
- .Close = Ext2_CloseFile
- };
-tVFS_NodeType gExt2_FileType = {
- .TypeName = "ext2-file",
- .Read = Ext2_Read,
- .Write = Ext2_Write,
- .Close = Ext2_CloseFile
- };
-
-// === CODE ===
-/**
- * \brief Reads a directory entry
- * \param Node Directory node
- * \param Pos Position of desired element
- */
-char *Ext2_ReadDir(tVFS_Node *Node, int Pos)
-{
- tExt2_Inode inode;
- tExt2_DirEnt dirent;
- Uint64 Base; // Block's Base Address
- int block = 0;
- Uint ofs = 0;
- int entNum = 0;
- tExt2_Disk *disk = Node->ImplPtr;
- Uint size;
-
- ENTER("pNode iPos", Node, Pos);
-
- // Read directory's inode
- Ext2_int_ReadInode(disk, Node->Inode, &inode);
- size = inode.i_size;
-
- LOG("inode.i_block[0] = 0x%x", inode.i_block[0]);
-
- // Find Entry
- // Get First Block
- // - Do this ourselves as it is a simple operation
- Base = inode.i_block[0] * disk->BlockSize;
- // Scan directory
- while(Pos -- && size > 0)
- {
- VFS_ReadAt( disk->FD, Base+ofs, sizeof(tExt2_DirEnt), &dirent);
- ofs += dirent.rec_len;
- size -= dirent.rec_len;
- entNum ++;
-
- if(ofs >= disk->BlockSize) {
- block ++;
- if( ofs > disk->BlockSize ) {
- Log_Warning("EXT2", "Directory Entry %i of inode %i extends over a block boundary, ignoring",
- entNum-1, Node->Inode);
- }
- ofs = 0;
- Base = Ext2_int_GetBlockAddr( disk, inode.i_block, block );
- }
- }
-
- // Check for the end of the list
- if(size <= 0) {
- LEAVE('n');
- return NULL;
- }
-
- // Read Entry
- VFS_ReadAt( disk->FD, Base+ofs, sizeof(tExt2_DirEnt), &dirent );
- //LOG("dirent.inode = %i", dirent.inode);
- //LOG("dirent.rec_len = %i", dirent.rec_len);
- //LOG("dirent.name_len = %i", dirent.name_len);
- dirent.name[ dirent.name_len ] = '\0'; // Cap off string
-
-
- // Ignore . and .. (these are done in the VFS)
- if( (dirent.name[0] == '.' && dirent.name[1] == '\0')
- || (dirent.name[0] == '.' && dirent.name[1] == '.' && dirent.name[2]=='\0')) {
- LEAVE('p', VFS_SKIP);
- return VFS_SKIP; // Skip
- }
-
- LEAVE('s', dirent.name);
- // Create new node
- return strdup(dirent.name);
-}
-
-/**
- * \brief Gets information about a file
- * \param Node Parent Node
- * \param Filename Name of wanted file
- * \return VFS Node of file
- */
-tVFS_Node *Ext2_FindDir(tVFS_Node *Node, const char *Filename)
-{
- tExt2_Disk *disk = Node->ImplPtr;
- tExt2_Inode inode;
- tExt2_DirEnt dirent;
- Uint64 Base; // Block's Base Address
- int block = 0;
- Uint ofs = 0;
- int entNum = 0;
- Uint size;
- int filenameLen = strlen(Filename);
-
- // Read directory's inode
- Ext2_int_ReadInode(disk, Node->Inode, &inode);
- size = inode.i_size;
-
- // Get First Block
- // - Do this ourselves as it is a simple operation
- Base = inode.i_block[0] * disk->BlockSize;
- // Find File
- while(size > 0)
- {
- VFS_ReadAt( disk->FD, Base+ofs, sizeof(tExt2_DirEnt), &dirent);
- dirent.name[ dirent.name_len ] = '\0'; // Cap off string
- // If it matches, create a node and return it
- if(dirent.name_len == filenameLen && strcmp(dirent.name, Filename) == 0)
- return Ext2_int_CreateNode( disk, dirent.inode );
- // Increment pointers
- ofs += dirent.rec_len;
- size -= dirent.rec_len;
- entNum ++;
-
- // Check for end of block
- if(ofs >= disk->BlockSize) {
- block ++;
- if( ofs > disk->BlockSize ) {
- Log_Warning("EXT2", "Directory Entry %i of inode %i extends over a block boundary, ignoring",
- entNum-1, Node->Inode);
- }
- ofs = 0;
- Base = Ext2_int_GetBlockAddr( disk, inode.i_block, block );
- }
- }
-
- return NULL;
-}
-
-/**
- * \fn int Ext2_MkNod(tVFS_Node *Parent, const char *Name, Uint Flags)
- * \brief Create a new node
- */
-int Ext2_MkNod(tVFS_Node *Parent, const char *Name, Uint Flags)
-{
- #if 0
- tVFS_Node *child;
- Uint64 inodeNum;
- tExt2_Inode inode;
- inodeNum = Ext2_int_AllocateInode(Parent->ImplPtr, Parent->Inode);
-
- memset(&inode, 0, sizeof(tExt2_Inode));
-
- // File type
- inode.i_mode = 0664;
- if( Flags & VFS_FFLAG_READONLY )
- inode.i_mode &= ~0222;
- if( Flags & VFS_FFLAG_SYMLINK )
- inode.i_mode |= EXT2_S_IFLNK;
- else if( Flags & VFS_FFLAG_DIRECTORY )
- inode.i_mode |= EXT2_S_IFDIR | 0111;
-
- inode.i_uid = Threads_GetUID();
- inode.i_gid = Threads_GetGID();
- inode.i_ctime =
- inode.i_mtime =
- inode.i_atime = now() / 1000;
-
- child = Ext2_int_CreateNode(Parent->ImplPtr, inodeNum);
- return Ext2_Link(Parent, child, Name);
- #else
- return 1;
- #endif
-}
-
-/**
- * \brief Rename a file
- * \param Node This (directory) node
- * \param OldName Old name of file
- * \param NewName New name for file
- * \return Boolean Failure - See ::tVFS_Node.Relink for info
- */
-int Ext2_Relink(tVFS_Node *Node, const char *OldName, const char *NewName)
-{
- return 1;
-}
-
-/**
- * \brief Links an existing node to a new name
- * \param Parent Parent (directory) node
- * \param Node Node to link
- * \param Name New name for the node
- * \return Boolean Failure - See ::tVFS_Node.Link for info
- */
-int Ext2_Link(tVFS_Node *Node, tVFS_Node *Child, const char *Name)
-{
- #if 0
- tExt2_Disk *disk = Node->ImplPtr;
- tExt2_Inode inode;
- tExt2_DirEnt dirent;
- tExt2_DirEnt newEntry;
- Uint64 Base; // Block's Base Address
- int block = 0, ofs = 0;
- Uint size;
- void *blockData;
- int bestMatch = -1, bestSize, bestBlock, bestOfs;
- int nEntries;
-
- blockData = malloc(disk->BlockSize);
-
- // Read child inode (get's the file type)
- Ext2_int_ReadInode(disk, Child->Inode, &inode);
-
- // Create a stub entry
- newEntry.inode = Child->Inode;
- newEntry.name_len = strlen(Name);
- newEntry.rec_len = (newEntry.name_len+3+8)&~3;
- newEntry.type = inode.i_mode >> 12;
- memcpy(newEntry.name, Name, newEntry.name_len);
-
- // Read directory's inode
- Ext2_int_ReadInode(disk, Node->Inode, &inode);
- size = inode.i_size;
-
- // Get a lock on the inode
- Ext2_int_LockInode(disk, Node->Inode);
-
- // Get First Block
- // - Do this ourselves as it is a simple operation
- base = inode.i_block[0] * disk->BlockSize;
- VFS_ReadAt( disk->FD, base, disk->BlockSize, blockData );
- block = 0;
- // Find File
- while(size > 0)
- {
- dirent = blockData + ofs;
- // Sanity Check the entry
- if(ofs + dirent->rec_len > disk->BlockSize) {
- Log_Warning("EXT2",
- "Directory entry %i of inode 0x%x extends over a block boundary",
- nEntries, (Uint)Node->Inode);
- }
- else {
-
- // Free entry
- if(dirent->type == 0) {
- if( dirent->rec_len >= newEntry.rec_len
- && (bestMatch == -1 || bestSize > dirent->rec_len) )
- {
- bestMatch = nEntries;
- bestSize = dirent->rec_len;
- bestBlock = block;
- bestOfs = ofs;
- }
- }
- // Non free - check name to avoid duplicates
- else {
- if(strncmp(Name, dirent->name, dirent->name_len) == 0) {
- Ext2_int_UnlockInode(disk, Node->Inode);
- return 1; // ERR_???
- }
- }
- }
-
- // Increment the pointer
- nEntries ++;
- ofs += dirent->rec_len;
- if( ofs >= disk->BlockSize ) {
- // Read the next block if needed
- BLOCK_DIR_OFS(Node->Data, block) = nEntries;
- block ++;
- ofs = 0;
- base = Ext2_int_GetBlockAddr(disk, inode.i_block, block);
- VFS_ReadAt( disk->FD, base, disk->BlockSize, blockData );
- }
- }
-
- // Check if a free slot was found
- if( bestMatch >= 0 ) {
- // Read-Modify-Write
- bestBlock = Ext2_int_GetBlockAddr(disk, inode.i_block, bestBlock);
- if( block > 0 )
- bestMatch = BLOCK_DIR_OFS(Node->Data, bestBlock);
- VFS_ReadAt( disk->FD, base, disk->BlockSize, blockData );
- dirent = blockData + bestOfs;
- memcpy(dirent, newEntry, newEntry.rec_len);
- VFS_WriteAt( disk->FD, base, disk->BlockSize, blockData );
- }
- else {
- // Allocate block, Write
- block = Ext2_int_AllocateBlock(Disk, block);
- Log_Warning("EXT2", "");
- }
-
- Ext2_int_UnlockInode(disk, Node->Inode);
- return 0;
- #else
- return 1;
- #endif
-}
-
-// ---- INTERNAL FUNCTIONS ----
-/**
- * \fn vfs_node *Ext2_int_CreateNode(tExt2_Disk *Disk, Uint InodeID)
- * \brief Create a new VFS Node
- */
-tVFS_Node *Ext2_int_CreateNode(tExt2_Disk *Disk, Uint InodeID)
-{
- tExt2_Inode inode;
- tVFS_Node retNode;
- tVFS_Node *tmpNode;
-
- if( !Ext2_int_ReadInode(Disk, InodeID, &inode) )
- return NULL;
-
- if( (tmpNode = Inode_GetCache(Disk->CacheID, InodeID)) )
- return tmpNode;
-
-
- // Set identifiers
- retNode.Inode = InodeID;
- retNode.ImplPtr = Disk;
-
- // Set file length
- retNode.Size = inode.i_size;
- retNode.Data = NULL;
-
- // Set Access Permissions
- retNode.UID = inode.i_uid;
- retNode.GID = inode.i_gid;
- retNode.NumACLs = 3;
- retNode.ACLs = VFS_UnixToAcessACL(inode.i_mode & 0777, inode.i_uid, inode.i_gid);
-
- // Set Function Pointers
- retNode.Type = &gExt2_FileType;
-
- switch(inode.i_mode & EXT2_S_IFMT)
- {
- // Symbolic Link
- case EXT2_S_IFLNK:
- retNode.Flags = VFS_FFLAG_SYMLINK;
- break;
- // Regular File
- case EXT2_S_IFREG:
- retNode.Flags = 0;
- retNode.Size |= (Uint64)inode.i_dir_acl << 32;
- break;
- // Directory
- case EXT2_S_IFDIR:
- retNode.Type = &gExt2_DirType;
- retNode.Flags = VFS_FFLAG_DIRECTORY;
- retNode.Data = calloc( sizeof(Uint16), DivUp(retNode.Size, Disk->BlockSize) );
- break;
- // Unknown, Write protect it to be safe
- default:
- retNode.Flags = VFS_FFLAG_READONLY;
- break;
- }
-
- // Set Timestamps
- retNode.ATime = inode.i_atime * 1000;
- retNode.MTime = inode.i_mtime * 1000;
- retNode.CTime = inode.i_ctime * 1000;
-
- // Save in node cache and return saved node
- return Inode_CacheNode(Disk->CacheID, &retNode);
-}
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